GrimmSpeed Air/Oil Separator Hardware Kit - 2002-07 Subaru WRX, 2004-21 Subaru STI


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GrimmSpeed SKU: GRM078052

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More Reliable with Better Serviceability

If you picked up a second hand GrimmSpeed Air Oil Separator, it is likely that you are missing most of the hardware pieces to go along with it. We are happy to offer replacement hardware kits to get your Subaru back on the road and keep blow-by under control!

If you are replacing the hardware, we also recommend picking up one of our AOS Rebuild kits to replace the O-Rings in the AOS body that can wear out over years of heat cycles.


  • 2x 1/2" Barb Couplers
  • 1x 1/2" Rubber Cap
  • 8x Zip Ties